54777981 has 8 divisors (see below), whose sum is σ = 73205440. Its totient is φ = 36434592.

The previous prime is 54777979. The next prime is 54777997. The reversal of 54777981 is 18977745.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 54777981 - 2¹ = 54777979 is a prime.

It is a super-2 number, since 2×54777981² = 6001254404872722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 54777981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54777911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19480 + ... + 22113.

It is an arithmetic number, because the mean of its divisors is an integer number (9150680).

Almost surely, 2^54777981 is an apocalyptic number.

It is an amenable number.

54777981 is a deficient number, since it is larger than the sum of its proper divisors (18427459).

54777981 is a wasteful number, since it uses less digits than its factorization.

54777981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42035.

The product of its digits is 493920, while the sum is 48.

The square root of 54777981 is about 7401.2148327150. The cubic root of 54777981 is about 379.7828422223.

The spelling of 54777981 in words is "fifty-four million, seven hundred seventy-seven thousand, nine hundred eighty-one".